921875 has 14 divisors (see below), whose sum is σ = 1171860. Its totient is φ = 725000.

The previous prime is 921871. The next prime is 921887. The reversal of 921875 is 578129.

It is not a de Polignac number, because 921875 - 2² = 921871 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 921875.

It is not an unprimeable number, because it can be changed into a prime (921871) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 15596 + ... + 15654.

921875 is a Friedman number, since it can be written as (9+1)^(8-2)-5^7, using all its digits and the basic arithmetic operations.

2⁹²¹⁸⁷⁵ is an apocalyptic number.

921875 is a deficient number, since it is larger than the sum of its proper divisors (249985).

921875 is an frugal number, since it uses more digits than its factorization.

921875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89 (or 64 counting only the distinct ones).

The product of its digits is 5040, while the sum is 32.

The square root of 921875 is about 960.1432184836. The cubic root of 921875 is about 97.3249103968.

The spelling of 921875 in words is "nine hundred twenty-one thousand, eight hundred seventy-five".